JPS625993Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake adjustment device for a motorcycle.

Generally, an internally expandable drum brake device is used as one type of brake device in a motorcycle. For example, in FIG. 1, this brake device a has a brake panel c rotatably fitted to a hub b of a wheel, and between the brake panel c and the hub b there is a hub b as shown in FIG. A pair of brake shoes e and f are provided inside the brake drum d, which is provided in It has a pressure-welded structure.
One end of a brake arm j is attached to the camshaft g, and a fork-shaped connecting piece k is formed at the tip of the brake arm j, and a pin m is inserted through and supported by the connecting piece k. Brake rod n is attached to this pin m.
is fitted into the brake rod n, and an adjustment nut p is screwed onto the tip of the brake rod n.
The brake rod n is biased toward the pin m by the repulsive force of a spring q provided on the brake rod n, and the pivoting start point of the brake arm j is adjusted by rotating the adjustment nut p.

On the other hand, wheels are sometimes removed from the vehicle body when changing tires, etc., and each time it is necessary to remove the adjustment nut from the brake rod, and after installing the wheel, it is necessary to rethread the adjustment nut and adjust the brakes again, which is a time-consuming process. It is something. For this reason, a structure has been proposed in which the brake rod can be removed from the brake arm without removing the adjustment nut (for example, Japanese Patent Application Laid-open No. 146448/1983), but there are problems such as the need for assembly.

In view of the above, the object of the present invention is to make the disengagement and engagement between the brake rod and the brake arm quick, easy, and reliable.

Embodiments of the present invention will be described below with reference to the drawings.

Example 1 This example is shown in FIGS. 1 to 4. FIG. 1 shows a front view of the brake device, and the brake device a is an internal expansion type drum brake device as described above, and the cam shaft g connected to the cam (see FIG. 9) has a brake arm 1. The base end of the brake arm 1 is connected, and the tip of the brake arm 1 is bifurcated to form an internal connection piece 2 and an external connection piece 3 (see the plan view in FIG. 2 and the parts diagram e in FIG. 3), The pin 4 is rotatably supported by both the connecting pieces 2 and 3.

A brake rod 5 is fitted into the pin 4, an adjustment nut 6 is screwed onto the tip of the brake rod 5, and an insertion piece 7 is slidably fitted on the opposite side of the adjustment nut 6 with the pin 4 in between. These pins 4
A brake adjustment device 8 is constituted by the adjustment nut 6, the insertion piece 7, and the inner and outer connection pieces 2 and 3.

The pin 4 has a total length that is approximately the same as the outer end dimensions of both the inner and outer connecting pieces 2, 3, and has a support portion 10 in the center into which the brake rod 5 is inserted, as shown in FIG. 3b, and a support portion 10 on one side. A large-diameter shaft support 11 is formed at one end, and a small-diameter shaft support 12 is formed at the other side. and the connecting pieces 2 and 3
Small diameter shaft portions 13 and 14 are formed that are slightly wider. Although the example in FIG. 3 shows an example in which the shaft support 12 and the small diameter shaft portion 14 have the same diameter, the invention is not necessarily limited to this, and the shaft support 12 and the small diameter shaft portion 14 may also have different diameters. No problem.

As shown in FIGS. 3c and 3d, the insertion piece 7 has both ends protruding forward as engaging parts 16 and 17, and an insertion piece main body 15, and an operating handle attached to the back surface of the central part of the main body. It is composed of a plate 18. The outer width of the main body 15 is formed to a width that allows it to be loosely fitted between the internal connecting piece 2 and the external connecting piece 3, and a through hole 19 into which the brake rod 5 is inserted is bored in the center, so that the brake rod 5 can be inserted into the through hole 19. Recesses 20 and 21 are formed on the tip surfaces of the portions 16 and 17, respectively, to fit into the small diameter shaft portions 13 and 14 of the pin 4.

A pressing spring 2 is also provided between the insertion piece 7 and the stop member 23 attached to the brake rod 5.
4 is provided, and the insertion piece 7 is
The engaging portions 16 and 17 are biased toward the pin 4 and are fitted into the small diameter shaft portions 13 and 14 of the pin 4, respectively.

The internal connection piece 2 and the external connection piece 3 include a third
As shown in Figures e and f, fitting holes 25 and 26 are drilled for fitting the large-diameter shaft support 11 and small-diameter shaft support 12 of the pin 4, respectively, and a connecting piece on the large-diameter insertion hole 25 side. 2 is provided with a notch 27 for allowing insertion and removal of the small diameter shaft portion 13 (see FIG. 1).

Next, the procedure for attaching and detaching the pin 8 will be explained based on the explanatory diagram of the assembly procedure shown in FIG. 4. (However, the brake lever is omitted in FIG. 4.) As shown in FIGS. 1 and 4a, the engaging portions 16 and 17 of the insertion piece 7 are normally pressed against the small diameter shaft portion of the pin 4 by the pressing spring 24. 13 and 14, thereby preventing the pin 4 from moving in the axial direction.

When removing the pin 4, the insertion piece 7 is moved against the pressing spring 24 (in the direction of arrow A in FIG. 1) and separated from the pin 4 (FIG. 1b). This allows the pin 4 to move in the axial direction, and the small diameter shaft part 13
By moving the small diameter shaft portion 13 toward the connecting piece 2 side (c in the same figure), the pin 4 can be easily extracted from the brake arm 1 by aligning the small diameter shaft portion 13 with the notch 27 (d in the same figure).

In the case of assembly, the above is the reverse.

Example 2 This example is shown in FIGS. 5 to 8.

FIG. 5 is a front view of the brake adjustment device 30, in which the brake rod 5, adjustment nut 6 and insertion piece 7 have the same structure as the previous example.
, the pin 31 and the adjustment nut 6 as in the previous example,
It is composed of an insertion piece 7, an internal connection piece 41 formed at the tip of the brake arm 40, and an external connection piece 42.

As shown in the parts diagram of FIG. 7, the pin 31 has a support part 32 in the center into which the brake rod 5 is inserted, and large-diameter shaft supports 33 and 34 at both ends, connecting the support part and the left and right shafts. Small-diameter shaft portions 35 and 36 each having a smaller diameter than the shaft support are formed between the shaft support and the shaft support, and a protrusion 37 having a diameter smaller than the shaft support 34 is formed protruding from one shaft end.

The internal connecting piece 41 and the external connecting piece 42 formed at the tip of the brake arm 40 have a structure for supporting the shaft supports 33 and 34, respectively, as shown in the plan view of FIG. 6 and the parts diagram of FIG. Fitting holes 43, 44
is drilled therein, and one connecting piece 41 is provided with a small diameter shaft portion 35 of the pin 31, and the other connecting piece 42 is provided with notches 45 and 46 for allowing the protruding portion 37 to be inserted and removed, respectively. ing.

The procedure for attaching and removing the pin 31 is the same as in the first embodiment, as shown in FIG. 8, and FIG. 8a shows the assembled state, FIG.
3 shows a state in which the pin 31 is moved in the axial direction so that the small diameter shaft portion 35 and the protruding portion 37 are aligned with the connecting pieces 41 and 42, respectively, and as shown in FIG. It can be easily removed.

In the case of assembly, the above is the reverse.

As described above, according to the present invention, there is no risk that the pin will be pulled out from the connecting piece due to the fitting of the insertion piece.
The connection between the brake rod and the brake arm is securely maintained, and the pin can be easily removed from the brake arm by simply retreating the insertion piece, making attachment and detachment operations extremely easy and quick. can.

[Brief description of the drawings]

1 to 8 illustrate embodiments of the present invention, and FIGS. 1 to 4 relate to Embodiment 1, in which FIG. 1 is an overall front view of the brake device, and FIG. 2 is a plan view of the brake adjustment device. Figures 3 and 3 are parts diagrams of the brake adjusting device, in which figure a is a front view of the adjusting nut, figure b is a plan view of the pin, figure c is a plan view of the insertion piece, and figure d is its Front view, Figure e is a partially cutaway front view of the connecting piece, Figure f is a plan view of the internal connecting piece, Figure 4 is an explanatory diagram showing the assembly procedure, Figures 5 to 8 are Embodiment 2. 5 is a front view of the brake adjusting device, FIG. 6 is a plan view thereof, FIG. 7 is a parts diagram of the brake adjusting device, FIG. 5a is a front view of the adjusting nut, and FIG. , Figure c is a front view of the connecting piece, Figure d is a plan view of the insertion piece, Figure e is its front view, Figure 8 is an explanatory diagram showing the assembly procedure, Figure 9 is a brake of the conventional structure. FIG. 3 is a front view of the adjustment device. 1... Brake arm, 2, 3... Connection piece, 4
... Pin, 5 ... Brake rod, 6 ... Adjustment nut, 7 ... Insert piece, 13, 14 ... Small diameter shaft part,
16, 17... Engaging portion, 24... Pressing spring, 27
...Notch.

Claims (1)

[Scope of utility model registration request] A pin is fitted into a two-pronged connecting piece formed at the tip of a brake arm connected to a brake device, a brake rod is fitted into the pin, and an adjustment nut is screwed onto the tip of the brake rod. At least one of the connecting pieces is formed with a notch, the pin is provided with a small diameter shaft portion, and the brake rod is provided with an engaging portion, and an insertion piece slides to the opposite side of the adjustment nut with the pin in between. The engaging portion is engaged with the small diameter shaft portion of the pin, and
The insertion piece is pressed against the pin side by a spring fitted into the brake rod, and the pin is moved in the pin axis direction, thereby allowing attachment and detachment from the notch at the small diameter shaft part. Brake adjustment device for motorcycles.